Abstract
The translocation t(12;16)(q13;p11), which cytogenetically characterizes myxoid liposarcomas (MLS), results in a fusion of the CHOP gene in 12q13 and the FUS gene in 16p11, creating a chimeric FUS/CHOP gene. We have identified two cases of MLS with translocations giving rise to recombination between 12q13 and 22q12. The result was a fusion of the N-terminal part of the EWS gene in 22q12, involved in a number of mesenchymal tumor types, with the CHOP gene and the creation of an EWS/CHOP chimeric gene. The presence of the EWS/CHOP chimeric gene in MLS shows that (i) the N-terminal part of FUS may be replaced by the N-terminal part of EWS in a CHOP fusion oncoprotein (ii) the two N-terminal parts, when fused to certain transcription factors, have a common or very similar oncogenic potential and (iii) the tumorigenic process in MLS and the morphogenetically distinctly different EWS-associated tumor types may be related.
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